mq5.0-source.src.share.java.examples.jms.BytesMessages Maven / Gradle / Ivy
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import java.io.*;
import javax.jms.*;
/**
* The BytesMessages class consists only of a main method, which reads a
* textfile, creates a BytesMessage from it, then reads the message. It does
* not send the message.
*
* Specify an existing text file name on the command line when you run
* the program.
*
* This is not a realistic example of the use of the BytesMessage message type,
* which is intended for client encoding of existing message formats. (If
* possible, one of the other message types, such as StreamMessage or
* MapMessage, should be used instead.) However, it shows how to use a buffer
* to write or read a BytesMessage when you do not know its length.
*/
public class BytesMessages {
/**
* Main method.
*
* @param args the name of the text file used by the example
*/
public static void main(String[] args) {
String filename = null;
FileInputStream inStream = null;
ConnectionFactory connectionFactory = null;
Connection connection = null;
Session session = null;
BytesMessage bytesMessage = null;
int bytes_read = 0;
final int BUFLEN = 64;
byte[] buf1 = new byte[BUFLEN];
byte[] buf2 = new byte[BUFLEN];
int length = 0;
int exitResult = 0;
/*
* Read text file name from command line and create input stream.
*/
if (args.length != 1) {
System.out.println("Usage: java BytesMessages ");
System.exit(1);
}
try {
filename = new String(args[0]);
inStream = new FileInputStream(filename);
} catch (IOException e) {
System.out.println("Problem getting file: " + e.toString());
System.exit(1);
}
try {
connectionFactory =
SampleUtilities.getConnectionFactory();
connection =
connectionFactory.createConnection();
session = connection.createSession(false,
Session.AUTO_ACKNOWLEDGE);
} catch (Exception e) {
System.out.println("Connection problem: " + e.toString());
if (connection != null) {
try {
connection.close();
} catch (JMSException ee) {}
}
System.exit(1);
}
try {
/*
* Create a BytesMessage.
* Read a byte stream from the input stream into a buffer and
* construct a BytesMessage, using the three-argument form
* of the writeBytes method to ensure that the message contains
* only the bytes read from the file, not any leftover characters
* in the buffer.
*/
bytesMessage = session.createBytesMessage();
while ((bytes_read = inStream.read(buf1)) != -1) {
bytesMessage.writeBytes(buf1, 0, bytes_read);
System.out.println("Writing " + bytes_read
+ " bytes into message");
}
/*
* Reset the message to the beginning, then use readBytes to
* extract its contents into another buffer, casting the byte array
* elements to char so that they will display intelligibly.
*/
bytesMessage.reset();
do {
length = bytesMessage.readBytes(buf2);
if (length != -1) {
System.out.println("Reading " + length
+ " bytes from message: ");
for (int i = 0; i < length; i++) {
System.out.print((char)buf2[i]);
}
}
System.out.println();
} while (length >= BUFLEN);
} catch (JMSException e) {
System.out.println("JMS exception occurred: " + e.toString());
exitResult = 1;
} catch (IOException e) {
System.out.println("I/O exception occurred: " + e.toString());
exitResult = 1;
} finally {
if (connection != null) {
try {
connection.close();
} catch (JMSException e) {
exitResult = 1;
}
}
}
SampleUtilities.exit(exitResult);
}
}